Grade |
Characteristics |
I. Normal |
Normal function in all areas |
II. Mild dysfunction |
Gross |
Slight weakness noticeable on close inspection |
May have slight synkinesis |
Normal symmetry and tone at rest |
Motion |
Forehead: Moderate to good function |
Eye: Complete closure with minimal effort |
Mouth: Slight asymmetry |
III. Moderate dysfunction |
Gross |
Obvious but not disfiguring difference between the two sides |
Noticeable but not severe synkinesis, contracture, or hemifacial spasm |
Normal symmetry and tone at rest |
Motion |
Forehead: Slight to moderate movement |
Eye: Complete closure with effort |
Mouth: Slightly weak with maximum effort |
IV. Moderately severe dysfunction |
Gross |
Obvious weakness and/or disfiguring asymmetry |
Normal symmetry and tone at rest |
Motion |
Forehead: None |
Eye: Incomplete closure |
Mouth: Asymmetric with maximum effort |
V. Severe dysfunction |
Gross |
Only barely perceptible motion |
Asymmetry at rest |
Motion |
Forehead: None |
Eye: Incomplete closure |
Mouth: Slight movement |
VI. Total paralysis |
No movement |